Abstract not found

Stability of current-driven modes in reversed field pinches with resistive walls and plasma rotation Phys. Plasmas 2, 442 (1995) (Received 22 February 1994; accepted 12 May 1994) The effect of a nonuniform resistive wall on the stability of plasma magnetohydrodynamical (MHO) modes is examined. For the case of a tokamak plasma interacting with a wall possessing toroidally nonuniform electrical resistance, the kink mode dispersion relation is found to reduce to a surprisingly simple form, provided that the scale of variation of the resistance is sufficiently large. The influence of a wall with toroidal gaps on tokamak plasma stability is investigated in some detail. Under some circumstances, kink modes are found to "explode" through the gaps with ideal growth rates. A similar investigation is made for a modular wall constructed of alternate thick and thin sections.

Sudden transient events – such as edge-localized modes (ELMs) – routinely occur in the tokamak edge during H-mode confinement. ELMs are plasma relaxations that cause a sudden drop in density and temperature of the pedestal plasma, leading to a significant loss of the stored plasma energy. Once the ELM-driven plasma pulse has crossed the magnetic separatrix, it travels

pronounced in the near UV and level off in the IR and can partly be attributed to observed surface changes. A novel periscope system was installed and mirrors exposed in a pilot experiment to simulate the transmission of light to distant sensors in ITER.

Suprathermal electron beams and large sheath potentials generated by

Numerical investigation of Scrape Off Layer anomalous particle transport for MAST parameters Enquiries about copyright and reproduction should in the first instance be addressed to the Culham

High-density plasma filaments extended along the magnetic field, which look like "blobs " in the plane perpendicular to B, have been observed in the scrape-off-layer (SOL) of many plasma devices. These objects become polarized and subsequently E×B drift to the wall carrying a significant

The two-dimensional fluid turbulence code SOLT is employed to study the role of midplane turbulence on the scrape-off-layer (SOL) heat flux width of tokamak plasmas. The physics simulated includes curvature-driven-interchange modes, sheath losses, and perpendicular turbulent diffusive

Abstract Transport of plasma from the edge pedestal gradient region into the scrape-off layer (SOL) forms the heat exhaust channel. The properties of this channel are critical for future tokamak devices. The SOL heat-flux width is believed to be set by a competition between classical parallel Phys

at the separatrix. filiT is reproduced by a fluid model of the parallel filament transport assuming the radial filament propagation speed of 400–1000 m s-1 in the near scrape-off layer, consistent with earlier experimental estimates. The conditional sampling used in experiment to measure filiT is tested